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We prove that any weakly symplectically fillable contact manifold is tight. Furthermore we verify the strong Weinstein conjecture for contact manifolds that appear as the concave boundary of a directed symplectic cobordism whose positive…

Symplectic Geometry · Mathematics 2025-04-29 Wolfgang Schmaltz , Stefan Suhr , Kai Zehmisch

We show that, in dimensions $n\geq 3$, continuity and boundedness do not restore the Sobolev regularity conjecture of Iwaniec and Martin for weakly quasiregular mappings below the critical exponent. For every bounded domain…

Complex Variables · Mathematics 2026-05-05 Stanislav Hencl , Yi Ru-Ya Zhang

In the vanishing viscosity limit from the Navier-Stokes to Euler equations on domains with boundaries, a main difficulty comes from the mismatch of boundary conditions and, consequently, the possible formation of a boundary layer. Within a…

Analysis of PDEs · Mathematics 2025-08-05 Christian Seis , Emil Wiedemann , Jakub Woźnicki

We show that closed hypersurfaces in Euclidean space with nonnegative scalar curvature are weakly mean convex. In contrast, the statement is no longer true if the scalar curvature is replaced by the k-th mean curvature, for k greater than…

Differential Geometry · Mathematics 2013-05-03 Lan-Hsuan Huang , Damin Wu

We construct a strictly pseudoconvex domain with smooth boundary whose squeezing function is not plurisubharmonic.

Complex Variables · Mathematics 2016-04-28 John Erik Fornæss , Nikolay Shcherbina

We disproving Seifert's conjecture for almost symplectic foliations with co-dimension bigger or equal to 3.

Differential Geometry · Mathematics 2016-10-26 Sauvik Mukherjee

For a domain $D \subset \mathbb C^n$, $n \ge 2$, let $F^k_D(z)=K_D(z)\lambda\big(I^k_D(z)\big)$, where $K_D(z)$ is the Bergman kernel of $D$ along the diagonal and $\lambda\big(I^k_D(z)\big)$ is the Lebesgue measure of the Kobayashi…

Complex Variables · Mathematics 2020-03-04 G. P. Balakumar , Diganta Borah , Prachi Mahajan , Kaushal Verma

Prompted by results of Guardo, Van Tuyl and the second author for lines in projective 3 space, we develop asymptotic upper bounds for the least degree of a homogeneous form vanishing to order at least m on a union of disjoint r dimensional…

Algebraic Geometry · Mathematics 2016-04-12 Marcin Dumnicki , Brian Harbourne , Tomasz Szemberg , Halszka Tutaj-Gasińska

We study the boundary and lens rigidity problems on domains without assuming the convexity of the boundary. We show that such rigidities hold when the domain is a simply connected compact Riemannian surface without conjugate points. For the…

Differential Geometry · Mathematics 2021-03-24 Colin Guillarmou , Marco Mazzucchelli , Leo Tzou

In contrast to the many examples of convex divisible domains in real projective space, we prove that up to projective isomorphism there is only one convex divisible domain in the Grassmannian of $p$-planes in $\mathbb{R}^{2p}$ when $p > 1$.…

Differential Geometry · Mathematics 2019-03-13 Wouter van Limbeek , Andrew Zimmer

We present, in detail and with a modern rigor, the two title proofs. The Weak Jordan Theorem (WJT) states that the complement of any topological circuit in the plane is disconnected.

History and Overview · Mathematics 2026-04-24 Martin Klazar

Properties of two classes of generally convex sets in the n-dimentional real Euclidean space, called m-semiconvex and weakly m-semiconvex, 1<=m<n, are investigated in the present work. In particular, it is established that an open set with…

Geometric Topology · Mathematics 2017-11-15 Tetiana Osipchuk

We prove the Pleijel theorem in non-collapsed RCD spaces, providing an asymptotic upper bound on the number of nodal domains of Laplacian eigenfunctions. As a consequence, we obtain that the Courant nodal domain theorem holds except at most…

Spectral Theory · Mathematics 2023-09-27 Nicolò De Ponti , Sara Farinelli , Ivan Yuri Violo

Cosmic censorship is known to fail in some well-controlled phenomena, calling into question the predictive power of General Relativity and opening up the possibility of observing Planck-scale physics. We propose that the cosmic censorship…

High Energy Physics - Theory · Physics 2022-03-07 Roberto Emparan

We generalize to arbitrary dimension our previous construction of simply connected weakly-special but not special varieties. We show that they satisfy the function field and complex analytic part of Campana's conjecture. Moreover, we give…

Algebraic Geometry · Mathematics 2023-08-28 Erwan Rousseau , Carlo Gasbarri , Amos Turchet , Julie Tzu-Yueh Wang

We prove a conjecture about mininmal index of certain representations of Coset Algebraic Conformal Field Theories under general conditions as formulated previously by us. As a by-product, the Kac-Wakimoto Conjecture (KWC) which is related…

Representation Theory · Mathematics 2007-05-23 Feng Xu

For a compact Riemannian $3$-manifold $(M^{3}, g)$ with mean convex boundary which is diffeomorphic to a weakly convex compact domain in $\mathbb{R}^{3}$, we prove that if scalar curvature is nonnegative and the scaled mean curvature…

Differential Geometry · Mathematics 2025-07-02 Dongyeong Ko , Xuan Yao

Minimal surfaces and domain walls play important roles in various contexts of spacetime physics as well as material science. In this paper, we first review the Bernstein conjecture, which asserts that a plane is the only globally well…

High Energy Physics - Theory · Physics 2009-09-28 Gary W. Gibbons , Kei-ichi Maeda , Umpei Miyamoto

In this paper, we show that any convex affine domain with a nonempty limit sets on the boundary under the action of the identity component of the automorphism group cannot cover a compact affine manifold with a parallel volume, which is a…

Geometric Topology · Mathematics 2019-07-31 Kyeonghee Jo , Inkang Kim

We prove that for any non-symmetric irreducible divisible convex set, the proximal limit set is the full projective boundary.

Metric Geometry · Mathematics 2021-06-15 Pierre-Louis Blayac